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279 results on '"Rappich, Jörg"'

9. Proton Radiation Hardness of Perovskite Tandem Photovoltaics

Author

Lang, Felix, Jošt, Marko, Frohna, Kyle, Köhnen, Eike, Al-Ashouri, Amran, Bowman, Alan R., Bertram, Tobias, Morales-Vilches, Anna Belen, Koushik, Dibyashree, Tennyson, Elizabeth M., Galkowski, Krzysztof, Landi, Giovanni, Creatore, Mariadriana, Stannowski, Bernd, Kaufmann, Christian A., Bundesmann, Jürgen, Rappich, Jörg, Rech, Bernd, Denker, Andrea, Albrecht, Steve, Neitzert, Heinz-Christoph, Nickel, Norbert H., and Stranks, Samuel D.

Published
2020
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26. Enhancing Hydrogen Evolution Reaction via Synergistic Interaction Between [Mo³S¹³]2- Cluster Co-catalyst and WSe² Photocathode

Author

Xi, Fanxing, Bozheyev, Farabi, Han, Xiaoyu, Rusu, Marin, Rappich, Jörg, Abdi, Fatwa F., Bogdanoff, Peter, Kaltsoyannis, Nikolas, and Fiechter, Sebastian

Abstract

Thiomolybdate [Mo3S13]2- nanocluster is a promising catalyst for hydrogen evolution reaction (HER) due to the high number of active edge sites. In this work, thiomolybdate cluster films are prepared by spin-coating of a (NH4)2Mo3S13 solution both on FTO glass substrates as hydrogen evolving electrodes and on highly 00.1-textured WSe2 for photoelectrochemical (PEC) water splitting. As an electrocatalyst, [Mo3S13]2- clusters demonstrate a low overpotential of 220 mV at 10 mA cm-2 in 0.5 M H2SO4 electrolyte (pH 0.3) and remain structurally stable during the electrochemical cycling as revealed by in-situ Raman spectroscopy. Moreover, as a co-catalyst on WSe2, [Mo3S13]2- clusters enhance the photocurrent substantially by more than two orders of magnitude (from 0.02 to 2.8 mA cm-2 at 0 V vs. RHE). The synergistic interactions between the photoelectrode and catalyst, i.e., surface passivation and band bending modification by the [Mo3S13]2- cluster film, promoted HER catalytic activity of [Mo3S13]2- clusters influenced by the WSe2 support, are revealed by intensity-modulated photocurrent spectroscopy (IMPS) and density functional theory (DFT) calculations respectively. The band alignment of the WSe2/[Mo3S13]2- heterojunction, which facilitates the electron injection, is determined by correlating UV-vis with photoelectron yield spectroscopy (PYS) results.

Published
2022

37. Infrared and Raman spectroscopic analysis of functionalized graphene.

Author

Hinrichs, Karsten, Neubert, Tilmann, Kratz, Christoph, Shaykhutdinov, Timur, Rappich, Jörg, and Balasubramanian, Kannan

Abstract

In this mini‐review, we discuss our work in the analysis of material properties of electrochemically functionalized graphene using infrared (IR) and Raman techniques as thin film sensitive vibrational spectroscopies. Multiscale characterization is demonstrated using a combination of IR spectroscopic ellipsometry (IRSE), confocal Raman spectroscopy (RS) and photothermal atomic force microscopy coupled IR analysis (AFM‐IR). IRSE is used for spots with dimensions of a few mm, RS for spots with a diameter of a few micrometer and AFM‐IR at the sub‐100 nm scale. In the first part of the article, functionalized large‐area graphene sheets electrochemically modified by ultrathin oligomer films of maleimidophenyl or 4‐aminophenyl acetic acid are studied. Characteristic molecular vibrations of the functional layers are analyzed by the IR methods, while the graphene‐related phonons are characterized by RS. This dual approach allowed for the determination of the attached functional groups as well as the identification of the nature of chemical coupling of the functional moieties to graphene. The thickness of the deposited layers extracted from IRSE data correlates very well with AFM measurements. In the second part of the article, functionalized graphene sheets are characterized by correlative vibrational optical spectroscopy directly at a device level. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Proton radiation hardness of perovskite tandem photovoltaics

Author

Lange, Felix R.L., Jošt, Marko, Frohna, Kyle, Kohnen, Eike, Al-Ashouri, Amran, Bowman, Alan R., Bertram, Tobias, Belen Morales-Vilches, Anna, Koushik, Dibyashree, Tennyson, Elizabeth M., Galkowski, K., Landi, Giovanni, Creatore, M. (Adriana), Stannowski, Bernd, Kaufmann, Christian A., Bundesmann, Jürgen, Rappich, Jörg, Rech, B., Denker, Andrea, Albrecht, Steve, Neitzert, Heinz-Christoph, Nickel, Norbert H., Stranks, S.D., Lange, Felix R.L., Jošt, Marko, Frohna, Kyle, Kohnen, Eike, Al-Ashouri, Amran, Bowman, Alan R., Bertram, Tobias, Belen Morales-Vilches, Anna, Koushik, Dibyashree, Tennyson, Elizabeth M., Galkowski, K., Landi, Giovanni, Creatore, M. (Adriana), Stannowski, Bernd, Kaufmann, Christian A., Bundesmann, Jürgen, Rappich, Jörg, Rech, B., Denker, Andrea, Albrecht, Steve, Neitzert, Heinz-Christoph, Nickel, Norbert H., and Stranks, S.D.

Abstract

Monolithic [Cs0.05(MA0.17FA0.83)0.95]Pb(I0.83Br0.17)3/Cu(In,Ga)Se2(perovskite/CIGS) tandem solar cells promise high performance and can be processed on flexible substrates, enabling cost-efficient and ultra-lightweight space photovoltaics with power-to-weight and power-to-cost ratios surpassing those of state-of-the-art III-V semiconductor-based multijunctions. However, to become a viable space technology, the full tandem stack must withstand the harsh radiation environments in space. Here, we design tailored operando and ex situ measurements to show that perovskite/CIGS cells retain over 85% of their initial efficiency even after 68 MeV proton irradiation at a dose of 2x10 12p+/cm2. We use photoluminescence microscopy to show that the local quasi-Fermi-level splitting of the perovskite top cell is unaffected. We identify that the efficiency losses arise primarily from increased recombination in the CIGS bottom cell and the nickel-oxide-based recombination contact. These results are corroborated by measurements of monolithic perovskite/silicon-heterojunction cells, which severely degrade to 1% of their initial efficiency due to radiation-induced recombination centers in silicon.

Published
2020

49. Energy-Level Alignment Tuning at Tetracene/c-Si Interfaces

Author

Niederhausen, Jens, primary, MacQueen, Rowan W., additional, Özkol, Engin, additional, Gersmann, Clemens, additional, Futscher, Moritz H., additional, Liebhaber, Martin, additional, Friedrich, Dennis, additional, Borgwardt, Mario, additional, Mazzio, Katherine A., additional, Amsalem, Patrick, additional, Nguyen, Minh Hai, additional, Daiber, Benjamin, additional, Mews, Mathias, additional, Rappich, Jörg, additional, Ruske, Florian, additional, Eichberger, Rainer, additional, Ehrler, Bruno, additional, and Lips, Klaus, additional

Published
2020
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